Phonograph record resurfacing machine



R. M. SOMERS PHONOGRAPH RECORD RESURFACING MACHINE July 30, l1940.

Filed March 29, 1939 4 Sheets-Sheet l INVENTOR Kzchrd Mbmens ATTORNEYJuly 3o, 1940. R. M MERS 2209,835

PHONOGRAPH RECORD RESURFACING MACHINE Filed March 29, 1939 4Shaets-Sheet 2 \l Y l E E 37 193 197 205 l f', 'f (e 202 34 51. 53 20/ iBY A TORNEY July 30, R M' SOMERS I rHoNoeRAPn aEcoRn nsunrxcwe mommaFiled March 29, 1939 4 sheets-sheet s July 30, 1940.

PHONOGRAPH RECORD RESURFACING MACHINE Filed March, 29. 1939 Smets-smet 4I INVENTOR RzclzarcM .Somers BY ht-g Kauai,... A QRNEY R. M. soMERs2,209,835

Patented July 30, 1940 UNITED` STATES aeoafsss,l

PHoNoGaAPH RECORD aEsURFAcmG MACHINE v Richard M. Somers, West Orange,N. J., as signorto Thomas A. Edison, Incorporated, West Orange, N. J., acorporation of New Jersey Application March 29, 1939, Serial No. 264,774

34o1aims- (c1. zia-'1.1)

This invention relates to machines for resurfacing phonograph records,and more particularly to improvements in such machines for facilitatingtheirv use. While the invention has particular utility, and is shown anddescribed in connection with a machine for resurfacing records of thetype primarily used in connection with commercial phonographs ordictating machines, no unnecessary limitation thereto is intended. Insome respects this invention has certain features in common with thosedisclosed in my copending application Serial No. 280,902, filed June 24,1939, and entitled Phonograph record resurfacing machines and in acopending application of George H. Fritzinger, Serial No. 246,304, filedDecember 17, 1938, and entitled Phonograph Yrecord resurfacing machines,which application is connected by common ownership with the presentapplication.

Phonograph record resurfacing machines of the type above mentionedcomprise a rotatable record support, usually in the form of a mandrel, acarriage movable along the mandrel, a controllable driving means forrotating the mandrel and moving or feeding the carriage', and aresurfacing tool mounted on the carriage and settable into operativeposition relative to a record on the mandrel. The operation ofresurfacing a record involves the performance of a series of primaryoperations comprising a mounting of the record on the machine, a settingof the tool into operative position, a starting of the driving means tocause rotation of the mandrel and a feeding of the carriage along themandrel in a direction operative to cause a refacing, or a cutting awayof a surface layer, of the record, a stopping of the driving means, andthen a removal of the record from the machine. These primary operationsmay each involve several sub-operations, all of which are to beperformed in certain sequence in the proper use of the machine.

It is an object of my invention to provide a phonograph recordresurfacing machine in which the various operations in the resurfacingof a record are largely automatically performed and controlled.

It is another object ofV my invention to provide a machine forresurfacing phonograph records which is highly simple in the control ofits operation and moreover well-nigh foolproof against mis-operation.

It is another object of my invention to provide new and improved controlmeans for a resurfacing machine.

' It is another object of -my invention to provide such new and improvedmeans in a phonograph record resurfacing 'machine as will render themachine essentially automatic in the performance of all operationsrequired in a record resurfacing'except for av change'of record on themachine. 4

It is another object of 'my invention to provide means by which themachine is putinto operation, as an incident to the mounting ofa recordon the machine, to cause a resurfacing of the record so mounted.

It is a further objectof my invention to provide, in a phonograph recordresurfacing machine, means rendered effective as an incident to a singlemanipulation yon the machine to perform all operations pertaining to arecord resurfacing except for a change of record on the machine. It is afeature'of my invention to cause thetool-'carriage to lbereciprocatedacross the record, from and tofav start position, for eachresurfacing ofa record, thei tool being, however, operative only duringthe last half cycle ofeach tool-carriage reciprocation.' y

l It is another object of my invention to provide a' feeding means forreciprocating the tool-carriage across the record from and to a startposition at predetermined 'and different rates of speed. n

It is another object of my invention toautomatically set the resurfacingtool into operative -position at the completionv of the first half cycleof each tool-carriage reciprocation.

It is another object of my invention to provide power operated means forsettingthe resurfacing tool.

It is another object to provide a driving means which is so controlledthatwhen the same is placed in operati-on it causes one reciprocation ofthe tool-carriage across the mandrel against and in a direction ofnormal record resurfacing movement.

Another object mandrel to be rotated only during the'movement of thetool-carriage in the direction of its record '1.45.

resurfacing movement. y

f It is anotherV object of my invention to provide a phonograph recordresurfacing machine which is so arranged and controlled that upon theperformance of a simple manipulation thereon a of my invention is tocause the from the following description and the appended claims.

In the description of my invention reference is had to the followingdrawings, of which:

Figure 1 is a top plan View, partly in section, of a phonograph recordresurfacing machine incorporating my invention, the various parts of themachine being shown in the positions they assume during the progress ofthe tool-carriage through its record resurfacing movement, thekdirection of which is indicated by the arrow shown;

Figure 2 is a right-hand sidelelevational View of the mechanism ofFigure 1;

Figure 3 is an enlarged right-hand, fragmen tary view, partly insection, of the mechanism of Figure 1;

Figure 4 is a fractional view of the tool-setting means partly insection on line 4 4 of Figure 3, showing the relative positions assumedby the tool-setting means when the tool is set in operative position;

Figure 5 is a fractional sectional view of the tool-setting means takenalong line 5 5 of Figure 2;

Figure 6 is a top plan view, partly broken away, of the rear right-handportion of the machine showing mechanism automatically operated at thecompletion of the first half cycle of each carriage reciprocation forplacing the machine in condition to produce a resurfacing of the record;

Figure 7 is a fractional vertical cross-sectional view taken along theline I-l of Figure 6;

Figure 8 is a right-hand View, taken on line 8 8 of Figure l and partlybroken away, showing an automatic clutch for coupling the driving meansof the machine to the mandrel;

Figure 9 is a diagrammatic view of the control circuit for the machine;

Figure 10 is a fractional front elevational View, partly in section,showing principally the aforementioned automatic conditioning mechanismfor the machine;

Figure 1l is a sectional view on line II-I I of Figure 10;

Figure 12 is a right-hand elevational view of mechanism, controlled bythe endgate latch, for starting the machine, the base plate of themachine appearing in cross-section substantially along'the line I2-I2 ofFigure 1; and

Figure 13 is a fractional horizontal sectional view taken substantiallyalong the line I3-I3 of Figure 12.

Reference being had to the figures, particularly Figures 1 and 2, therewill be seen a phonograph record resurfacing machine incorporating myinvention and comprising a base plate I having a ilange I extendingdownwardly from the rim thereof and provided with a left-hand uprightstandard 2, right-hand upright standards 3 and 4, and an intermediateupright standard 5. In the right-hand portion of the base plate adjacentto the` standard 4 there is an upright boss 6 on which there is pivoted,by a screw 1, an endgate 8 biased into open position by a torsionalspring 9 but normally heldin a closed position (as shown in Figure l) bya latch'vll pivoted as at II to the right end portion I2' of a guiderail I2 which extends laterally along the front of the machine.Respectively carried by the endgate 8 and standard 2 are oonicallypointed studs -I4 and I5 which form right and left thrust bearings for ashaft I6. This shaft passes through an oversized hole I1 in theintermediate standard 3 and carries amandrel I8 for holding acylindrical record I9 to be resurfaced'. In the operation of mounting arecord on, or removing a record from, the mandrel IS the endgate 8 isswung open to free the right end of the mandrel. When the endgate isopen the shaft I6 is intermediately supported by the standard 5, but isretained in engagement with the stud I5 by a collar 20, secured to theshaft by a screw 2U', which abuts against the intermediate standard tolimit the longitudinal movement of the shaft.

Supported by the left and right standards 2 and 4 is a longitudinal rod2| on which there is slidably mounted a carriage 22 having a sleeve 23embracing the rod as shown in Figure 2. The carriage 22 is substantiallysemi-circular in shape, curving forwardly from the rod 2| over the man-`drel I 8 and terminating in a relatively heavy front portion 22. In theportion 22 there is provided a slot 24 which slidably ts on a for-Wardly extending shoulder 25 provided on and along the guide rail I2.The carriage is thus mounted for sliding movement back and forth across,and throughout the length of, the mandrel I8, but is prevented frombeing tilted upwardly by the engagement of the slot 24 with the shoulder25.

On the right side of the carriage there is provided an extension 25,square-shaped as viewed from the side thereof, which substantiallyoverlies the rod 2l. This extension carries a resurfacing tool 2lcomprising a knife blade 28 mounted on a knife bar 29 which is slidablysupported by the extension 26 for movement towards and away from therecord, the bar 29 being restricted against turning by a key 3l)engaging a longitudinal slot 3| provided in the bar. The means forsetting the resurfacing tool into operative position-a position of thetool in which the knife blade 28 engages the record-and for releasingthe same therefrom may be substantially of a construction such as isdescribed in my copend- -ing application Serial No. 232,766, led OctoberA tool-setting means of the above-mentioned type is shown in Figures l,2, '3, 4 and 5, and comprises an olf-set gauge 32 to permit the settingA of vthe tool while the tool is off the record. The gauge 32 isslidably supported by the extension 23 to the left of the knife bar 29,there being provided in the extension 26 left and right parallelopenings 33 and 34, radially disposed with respect to the mandrel I8,through which the gauge and bar respectively pass. Ihe bar and gauge arecoupled to each other by means of an apertured link 35 which ts onreduced-diameter end portions 29 and 32 respectively provided along theupper parts of the bar and gauge, the link 35 being fastened on thereduced-diameter portion 32 of the gauge by a press t but being freelyslidable along the reduced-diameter portion 29 of the bar. The bar 2S isnormally retained in a Xed position relative to the gauge by means of arelatively light compression spring 36 coiled about the reduced-diameterportion 29 of the bar between the link 35 and a lock nut 3l at the upperend of the bar. The gauge 32 is controlled by a cap 32 which slidably tsover the extension 26 and which is guided in its movement by a guide rod39, secured to the cap and slidably passing through an opening 40provided in the extension 26 in parallel relation to the openings 33 and34. The cap 38 is apertured to slidably t the reduced-diameter portion32 of the gauge but is restricted-inl upward movement relative theretoby a head 4l on the gauge. The cap is normally held in contact with thehead 4I-i. e.,

urged upwardly relative to the gauge-by a compression spring 42 coiledabout the reduced-diameter portion 32 of the gauge between the cap andthe link 35, and the cap is moreover urged upwardly relative to thecarriage extension 26 by a relatively heavy compression spring 43 coiledabout the guide rod 39. This upward urging of lthe cap 38 relative tothe extension 26 normally retains the gauge 32 in unoperated position,dened by the Contact of a collar 44 on the gauge with the underside ofthe extension 26. When the gauge 32 is in unoperated position theresurfacing tool 21 is biased into inoperative position by reason of thespring 36 which urges the knife bar 29 upwardly into a position defined`by the contact of a collar 45 on the bar with the underside of thecarriage extension 26, an enlarged opening 46 being provided in the cap38 to permit the knife bar 29, and lock nut 31 mounted thereon, to passfreely therethrough in the movement of the resurfacing tool toinoperative position.

To set the resurfacing tool into operative position a downward movementis applied to the cap 3B. The means for applying such downward movementto the cap comprises a tool-setting lever 46 pivotally supported by apost 41 provided on the right side of the carriage extension 26. Thelever is retained on the post 41 by means of a nut 48 and locking screw49, and is connected to the cap 38 by a link 56 pivotally connected toan upwardly extending arm 46 of the lever 46 by a screw 5I and to theright side of the cap by the screw 52. The lever 46 is normally held inaposition as shown in Figure 2 by reason of the upward biasing of the cap38. When the lever 46 is turned in a counter-clockwise direction fromthe position just mentioned the cap is moved downwardly to move thegauge 32 and knife bar 29 towards the record, the link 50 being curvedto clear a tool-locking means on the post 41, hereinafter described, inthis counter-clockwise movement of the lever 46.

A downward movement ofthe cap 38 causes both the gauge 32 and knife bar29 to be yieldably moved, by reason of the spring 42, towards therecord. The knife blade 28 on the knife bar will normally not contactthe record in the setting of the resurfacing tool since, in the normaloperation of my invention, the resurfacing tool is set into operativeposition while the carriage is in the right end portion of its travel,the tool being then to the right of the record. The gauge 32, which isto the left of the tool, will, however, contact the record to define theoperative position of the tool relative to the record.

When the lever 46 is moved in a counter-clockwise direction, the tool isfirst moved into operative position and then, in the terminal movementof the lever, the tool is locked, thereby setting the tool. Thetool-locking means is shown in Figures 2, 3, 4 and 5, and comprises apin 53 which is slidably mounted in the carriage eX- tension 26 fortransverse movement relative to the longitudinal movement of the knifebar 29. The inner end of the pin 53 slidably contacts a fiat 54 on theknife bar, and the outer end extends slightly beyond the right side ofthe carriage extension. Pivoted on the post 41 between the lever 46 andthe carriage extension 26 is a disk-shaped locking member 55 having anopen sector 55 of substantially 90 angular length and provided with anannular shoulder 55" conveniently serving as a bearing for the toolsetting lever 46. On the inner wall of the member 55 there is provided abeveled cam face 56. When the member 55 is turned in a counter-clockwisedirection the cam face contacts the outer end of the pin 53 and pressesthe pin tightly against the knife bar to cause a locking of the baragainst longitudinal movement. In order that such counter-clockwisemovement of the member 55 will occur as an incident to they terminalmovement of the lever 46, the lever 46 is provided with a lateral pin 51which extends into the open sector 55. As the lever 46 is moved to setthe tool the pin 51 rst traverses the sector 55 and then encounters anedge 58, defining the counterclockwise side of the open sector 55', tocause the member 55 to move in unison with the terminal movement of thelever 46, thereby locking the resurfacing tool in operative position.When the lever 46 is next released it is returned in a clockwisedirection by reason of the upward biasing of the cap 38, the pin 51 thentraversing the open sector 55 and the member 55 remaining in toollockingposition by reason of the friction between the pin 51 and the member.The resurfacing tool is thus maintained in operative position upon therelease of the lever 46, but the gauge 32 is retracted, or returned toits unoperated position, by the spring 43, the spring 36 being, however,compressed by the return of the gauge, as is indicated in Figure 4.Although the spring 36 resists the retraction of the gauge, the spring43, which urges the cap 38 upwardly, is made sufciently strong toovercome the resistance of this spring. The spring 36 is, however,strong enough to return the resurfacing tool to inoperative positionupon the unlocking of the tool, such toolunlocking occurring as anincident of moving the member 55 slightly in a clockwise direction tofree the cam face 56 from the pin 53.

After the resurfacing tool is set .into operative position the record isput in rotation and the carriage is moved steadily across the record insuch direction as to cause a surface layer of the record to be cut awayby the tool. This cut-away layer, commonly known as shaving chips, iscaught by a chip chute 56 secured to the knife bar 29 by the screw 59',which directs the chips downwardly through an opening 6D in the baseplate, as for example, into a suitable container not shown.

In accordance with my invention the carriage 22 is reciprocated acrossthe record for each record resurfacing operation, this reciprocationbeing preferably'from and to a start position at the left end of therecord. During the first half cycle of such carriage reciprocation-i.e., during the time the carriage is traversing the record in a rightwarddirection--the resurfacing tool is in inoperative position and themandrel I8 is stationary. At the completion of this first half cycle ofcarriage movement the carriage remains stationary for a predeterminedtime interval. During this interval a series of automatic actions occurto cause the setting of the resurfacing tool into operative position andthen the retraction of thel tool-setting gauge 32, after which themandrel is placed in rotation and the carriage is returned through thelast half cycle of its movement to start position to cause a resurfacingof the record. When the carriage has been returned to start position tocomplete one cycle of reciprocative movement across the record, thecarriage movement and mandrel rotation are each stopped and theresurfacing tool is released to inoperative position, thus restoring themachine into normal inoperative condition. Upon restarting the machinethe above cycle of operations is repeated: ther carriage being rst movedrightwardly into a position wherein the tool is to the right of therecord, the movement of the carriage being next stopped, the tool beingset, a mandrel rotation and a reverse carriage movement being nextstarted, and then at the completion of the record resurfacing movementof the carriage the tool being released to inoperative position and themachine being stopped. In the description of the above operations thedriving means for the machine may be first described.

The driving of the carriage 22, as well as the rotation of the mandrelI8, may be effected by a suitable motor M, schematically shown in Figure9, which may be located beneath the base plate and be coupled to apulley 8| on the mandrel shaft iii as by a suitable belt not shovm whichmay pass through an opening G2 in the base plate. Integrally formed withthe pulley 8| is a drive pulley 83 adapted to be coupled by a belt (notshown) to a pulley Ei provided at the left end of a laterally extendingfeed screw S5. This feed screw is rotatably supported by the standards 2and il respectively carrying conically pointed studs 55 and 6l whichserve as thrust bearings for the feed screw. Integrally formed with thecarriage sleeve is a block 68 (see Figures 1 and 3) to which is securedby screws 99 a resilient, rearwardly extending arm 'lll carrying a feednut normally engaging the undersi-de of the feed screw E5. Thus, arotation of the feed Screw causes the carriage to be fed, or drivensteadily, along the mandrel, the direction of carriage movementdepending upon the direction of rot-ation of the feed screw.

The motor M may be of a series type, comprising a field 'E2 and armaturei3 adapted to be connected with a suitable source of power by way of apower supply circuit 'M and plug 15. While the eld l2 and armature i3are serially connected in the power supply circuit lll, the connectionof the armature in the circuit is by way of a double-pole double-throwswitch 18 operable to reverse the polarity of the armature relative tothat of the field to control the direction of rotation of the motor. Theswitch 16 comprises pole members ll and 'i8 serially connected withcontact members ll and 18' when the switch pole members are thrown tothe left (as the switch appears in Figure 9) and with contact members lland 18" when the pole members are thrown to the right. The contactmembers il and 'i8' are directly connected by a circuit 19 with thearmature '13, and are moreover connected in criss-cross fashion with thecontact members i8 and il, the contact members 'il' and lil beingconnected together by a conductor 8l) and the contact members i8 and Ilbeing connected by a conductor 8|, the conductor 8|, however, seriallyincluding an adjustable resistor 82 and an openable and closable switch83. When the switch i6 is thrown to the left the field 'l2 and armature'i3 are directly and serially connected in the circuit lil with suchrelative polarity as to cause the feed screw 55 to be rotated in adirection to move the carriage from left to right. When the carriagereaches the end of its rightward travel the switch 18 is automaticallythrown to the right, as is hereinafter described, to reverse thedirection of rotation of the motor M so that the carriage will be nextreturned to the left. The rate of the motor speed during the return orleftward movement of the carriage is controlled by an adjustment of theresistor 82, this adjustment being such as to effect a normal rate ofrecord resurfacing movement of the carriage. Since the rightwardmovement of the carriage is an idle movement in the normal operation ofthe machine, by reason of the resurfacing tool being then not set inoperative position, the carriage is permitted to move rightwardly at arelatively high rate of speed, this increased speed being caused byreason of the resistor 82 being then out of the motor circuit.

The integral pulleys 6| and 63 are mounted for rotation on the mandrelshaft IB by means of left and right ball-bearing assemblies 84 and 85interposed between the pulleys and the shaft and respectively fittinginto left and right annular recesses 84 and 85' provided in the pulleys(see Figure l), the pulleys being restricted against longitudinalmovement on the shaft in a rightward dire-ction by the abutment of theright ballbearing assembly 85 against a shoulder 86 on the shaft andagainst movement in a leftward direction by the abutment of the leftbearing assembly 84 against a stop collar 81 on the shaft.

While the pulleys as above described are freely rotatable in eitherdirection on the mandrel shaft I there is provided a one-way actionclutch means for causing the mandrel shaft I8 to be gripped to thepulleys when the pulleys are turned in one of their movable directions.This. one-way actionclutch means is illustrated in Figures 1 and 8 andcomprises an annular flange 88 extending rightwardly from the rim of thepulley 9|. To the right of the pulley 6| and within the flange 88 thereis provided a disk 89. This disk is rotatably free of the pulley 8| andflange 88 and is secured to the mandrel shaft IB by a pin 95| extendingthrough the hub 89' of the disk. As shown in Figure 8, the disk 89 isprovided with a plurality (three in the present instance) of notches 9|cut in the periphery of the disk at equal angular distances from eachother. These notches extend axially through the disk and are eachright-angular in cross section, having one side 9| in radial alignmentwith the disk and the other side 9|" extending from the side 9| in acounterclockwise direction about the disk, as shown in Figure 8.Provided in each of the notches 9| is a laterally extending roller 9.2of a length substantially equal to the width of the disk, the rollersbeing retained in their respective notches by the right wall 6| of thepulley 6| and by an annular plate 93 secured to the right wall of thedisk 89 by rivets 93. Provided in the side 9| of each of the notches 9|is a recess 94 forming seats for respective compression springs 95 whichurge the respective rollers 92 each in a counter-clockwise direction.The rollers 92 by reason of their biasing are normally wedged betweenthe flange 88 and the side 9| of each of the notches 9| to cause thedisk to be normally rotatably coupled to the flange. When the flange isturned in a counterclockwise direction this wedging of the rollerscauses the mandrel shaft to be turned in unison with the pulley 6 Whenthe flange 88 or pulley 6| is, however, turned in a clockwise directionthe rollers 92 are each continually moved against their biasing and outof their wedged positions abovementioned, as by the friction between theflange and the rollers. In the clockwise movement of the pulley 6| themandrel shaft |6 is thus no longer rotatably coupled therewith exceptfor the friction between the pulleys 6| and B3 and the mandrel shaft,which friction arises from the contact of the ange 88 with the rollers75 92 and from the bearing assemblies 84 and 85. In the rightwardmovement of the carriage Aacross the mandrel the pulleys 6| and 63,aswell as the feed screw G5, are eachturned in a clockwise direction asviewed from the right sides thereof. During such rotation of the pulley6| the clutch between the pulley 6| and mandrel shaft I6 is maintainedinoperative, as above described. I-owever to insure that the mandrelwill not then be rotated by reason of the friction between the pulley 0|and mandrel shaft I6, as above noted, there is provided a mandrel brake(see Figures l and 3) comprising a lever 95 pivoted by a screw 91 to abracket 08 secured to the top side of the base plate, to the rear of thestandard 5, by the screws 9S. The lever 96 is provided with a cross rod|00 carrying a shoe I0| which is adjacent to the left end of themandrel. The lever 96 is biased over center by a tension spring |02connected between a pin |03 on the lever and a pin |04 on the baseplate. This biasing of the lever 98 causes the brake to snap intoinoperative position, defined by the contact of the lever 96 with a stoppin |05 on the base plate I, and operative position, defined by thecontact of the shoe IOI with the adjacent end of the mandrel, as thelever is moved through dead center in the direction to place the brakein inoperative and operative positions. When the brake is brought intooperative position the friction between the shoe |0| and the mandrelcauses the mandrel rotation to be retarded. During the first half cycleof each carriage reciprocation-as when the carriage is moved to therightthe mandrel brake is maintained in operative position to hold themandrel against rotation, as is hereinafter described.

The means forvplacing the driving means in operation to start a feedingof the carriage in a rightward direction across the mandrel comprisesthe aforementioned reversing switch 10 schematically shown in Figure 9.This switch isV preferably of the well-known toggle variety (see Figuresl and 2) having a threaded neck portion |00 from which extends an arm|01 adapted to snap into its respective positions. The switch 10 ismounted on a bracket |00 secured by the screws |09 to the flange i ofthe base plate in the front right-hand portion thereof. The bracket isapertured to receive the neck portion |06 of the switch, the switchbeing retained to the bracket, by a collar I I0 threading on the neckportion,in such orientation as to bring the movementlof the switch armin a verticaldirection. Pivoted by a screw III on a boss ||2 extendinginwardly, from the portion of the flange I which lies along the rightside of the base plate is a relatively long lever |I3 extending fromfront to back beneath the machine. The front portion I I3 of the leveris offset to the left and apertured to receive the switch arm |01.Extending-up from the front portion I I3' of the lever is a relativelyshort arm |I4 provided with a flngerpieoe IIE which passes through anopening I|6 in the top of the base plate. When the arm |01 of the switch16 is in an upward position the flngerpiece projects slightlyabove thebase plate as shown in Figure 2. This upper position of the arm |01represents the condition of the switch 16 when its pole members 11 and18 respectively make connection with the contact members 11 and 18",this being the condition of the switch to cause a leftward orrecordresurfacing movement of the carriage. When the carriage is atstart position the vaforementioned switch 83 is retained in openposition vthe sleeve on the shaft.

to render 'the driving means inoperative, asis vhereinafter described.`However, upon moving ward travel it causes a cam mechanism ||1 to be setinto operation to first stop the carriage movement by disengaging thefeed nut 1| from the feed screw 65 and then to set the resurfacing toolinto operative position, after which the cam mechanism moves the mandrelbrake to inoperative position, :fe-engages the feed nut with the feedscrew and reverses the direction of rotation of the motor M to causerecord rotationand a return feed or record resurfacing movement of thecarriage.

The cam mechanism II1 isdisposed vbeneath the base plate I in therearward right-hand portion thereof, as shown in Figures l, 2, 6 and l0,and comprises four differently shaped cam members IIB, H9, |20 and I2|mounted from left to right on a laterally extending shaft |22 rotatablysupported at its left end by a standard |23 extending downwardly fromthe base plate and at its right end by a leg |24 extending downwardlyfrom the flange of the base plate, the shaft being restricted againstlongitudinal movement in its bearings by apair of stop collars |25 and|26, secured to the shaft by the respective pins |25 and |26', whichrespectively abut against the left and right sides of the standard |23.While the several cam members are ycomparable with each other indiameter, cam members I I8 and |20 are substantiallyY longer in theiraxial dimensions than the cam members ||9 and |2l, the cam members I |8and |20 respectively having annular recessesV I I8 and |20 cut in fromthe right sides thereof to reduce their respective weights, as

shown in Figure 11. The cam members of the 'pair IIB-I I9, Yas well asthose of the pair |20- 12|, are immediately adjacent to each other,`

but the cam vmembers ||9 and |20 are spaced a small distance from eachother along the shaft.

lhollowed out along its central portion to provide left andright'bearing surfaces |28 and |29 of The sleeve, and cam membersfixedly mounted thereon, are thus free- Aly rotatably mounted on theshaft |22; but are 'restricted against longitudinal movement on theshaft, the restriction in rightward and leftward directions beingeffected by the respective abutlments of the sleeve |21 against the leg|24 and an annular ring |22 integrally formed with the vshaft.k

During the operation of the machine the shaft '|22 is rotatedcontinuously, being driven by the feed screw 65 from a worm |30 providedon a shaft portion 65 at the right end of the feed screw. Engaging theworm |30 is a gear |3I secured by apin I3I to a vertical shaft |32rotatably mounted-in and passing through a long boss |33l which extendsabove and below the base plate I.v Securedby a pin |34 to the lower `endof the shaft |32 isa bevel gear |34 which engages with a similar bevelgear |35 secured to the shaft |22 by a pin |36. The direction of thecoupling between the feed screw 65 and the shaft |22 is such that whenthe feed screw is turned in a clockwise direction-the direction forimparting a rightward movement to the carriage 22-the shaft |22 is alsoturned in clockwise direction, this' direction of turning of the shaft|22 being of course reversed when the direction of rotation of the feedscrew is reversed to return the carriage to its start position.

The cam members ||8, ||9, |26 and |2| are normally held in their initialor start positionthe position in which they are Shown in the gures-bythe engagement of a detent |28, secured to the leg |24, with a notch |2|on the right face of the cam member |2|. The cam members may, however,be rotatably connected to the shaft |22 by means of a clutch |31comprising a toothed clutch member |38 splined to the shaft |22 formovement between the gear |35 and the cam member |8. This splining isdone by means of a pin |39 extending through the hub of the clutchmember and engaging a groove segment |46 extending longitudinally of theshaft, as is shown in Figure 11. W'hen the clutch member |38 is moved tothe right into contact with the cam member |8, it engages a tooth |4I,provided on an annular ange |4l extending leftwardly of the cam member,to rotatably couple the cam members with the shaft |22.

The means for controlling the clutch |31 comprises an over-centermechanism adapted to urge v the clutch into its engaged and disengagedpositions depending upon the direction in which the mechanism is thrown.This over-center mechanism, shown in Figures 6 and 10, comprises arelatively long arm |42 pivoted to a boss |43 extending downwardly fromthe base plate at a point slightly to the rear of the clutch member |38.The arm |42 extends forwardly from its axis over the clutch member |138and carries, at a point directly overlying the clutch member |38, a pin|44 which extends downwardly to engage an annular groove |38 intheclutch member. Pivoted by a screw |45 on the forward end of the arm |42is an upstanding post |45 having a radially extending rod |46 near theupper end thereof. Substantially above the post |45 is a relativelyshort lever |41 which is pivoted at a point substantially centrally ofits length to a boss |48 extending downwardly from the base plate. Thelever |41 is restricted in its turning to small angular movements inclockwise and counter-clockwise directions from a central orfront-to-back extending position as is hereinafter described. Pivoted tothe rearward end of the lever |41 by a shoulder screw |50 is a post |56extending downwardly from the lever and apertured near its lower end toreceive the rod |46. Coled about the rod |46 between the posts |45 andYT58 is a relatively heavy compression spring When the lever |41 ismoved in a counter-clockwise direction through its central positionuntil the post |56 carried by the lever is slightly to the left of thepost |45 carried by the arm |42 the compression spring |5| urges the arm|42 in a rightward direction to cause the engagement of the clutch |31,and when the lever |41 is returned in a clockwise direction until thepost |58 is slightly to the right of the post |45, the spring |5| urgesthe arm |42 leftwardly to cause the disengagement `of the clutch.

The lever |41 is biasedin a counter-clockwise directionthe direction ofmovement of the lever to cause engagement of the clutch |31--by atension spring |52 connected between the lever and a pin |53 on the baseplate. The lever 41 is controlled in its movement by the contact of thefront tip |41' of the lever with a catch |54 on a laterally extendingand relatively long pawl |55 pivoted at its right end, by a screw |56,to the left end of a slide member |51. This member |51 is mounted forlateral movement by means of a pair of shoulder screws |58 respectivelypassing through a pair of elongated slots |59 in the member to threadinto a pair of bosses |60 extending downwardly from the base plate. Themember |51 is normally retained in its most leftward position shown inFigure 6, as is hereinafter described; the pawl |55 is urged rearwardlyin a clockwise direction into its normal position, defined by thecontact of a stop lug |6| on the pawl with the rear edge |51 of themember |51, by a tension spring |62 connected between the stop lug |6|and a lug |63 turned down from the member 51. When the member |51 andpawl |55 are in such respective normal positions the lever 41 isretained, against its biasing, by the Contact of its tip |41 with thecatch |54 in its clockwise position shown in Figure 6, the clutch |31being then disengaged as above described.

When the pawl |55 is tripped-i. e., turned in a counter-clockwisedirection to release the catch |54 from the lever |41-the spring |5|moves the lever |41 in a counter-clockwise direction, as against a stoppin |64 extending downwardly from the base plate, to cause theengagement of the clutch |31. Such tripping of the pawl |55 is effectedby the carriage 22 when the carriage nears the end of its rightwardtravel across the record. The means for causing this tripping by thecarriage comprises a lever |65 pivoted by a screw |66 to a boss |61extending downwardly from the base plate. The lever |65 extendsrearwardly from its axis and carries a relatively long vertical pin |68,near its rearward end, which extends upwardly through an arcuate opening|69 in the base plate, the lever being normally held in a leftwardposition defined by the contact of the pin |68 with the left end of theopening |69 by a tension spring |16 connected between the lever and apin |1| on the base plate. Provided on the lever |65 near its axis is ashort rightwardly extending arm |12 on which there is pivoted as at |13a V-shaped pawl |14 which is biased in a counter-clockwise directioninto a position defined by the contact of a stop lug |15 on the pawlwith the right edge |65 of the lever |65, the biasing being done by atension spring |16 connected between the stop lug |15 and a lug |11turned down from the lever |65. As the carriage nears the end of itsrightward travel, a rightward extension |18 of a rearwardly anddownwardly extending arm |18, which is secured to the carriage sleeve 23by a clamp |19, encounters the pin |68 of the lever |65 to cause arightward or clockwise movement of the lever. As the lever |65 is somoved the pawl |14 imp-ingcs upon the pawl |55 and thereby moves thepawl |55 to free the catch |54 from the lever |41 (the pawl |14 havingits end portion which impinges upon the pawl |55 increased in thicknessby the Welding of a piece |14 thereon, as shown in Figures 6 and 10).The lever |41 then moves, as because of its biasing, in acounter-clockwise direction to cause the engagement of the clutch |31.

V`gWhen'the'clutch I 31 is engaged by the'carriage the cam members IIB,||9, |20 and |2I, by reason of their coupling to the shaft |22, areturned in unison in a clockwise direction from their initial or startposition. In substantially one revolution of the cam members, a seriesof actions take place to cause the machine to be conditioned to effect arecord resurfacing operation.

One of the above series of actions is to prepare for operation the meansfor disengaging the clutch |31-i. e., to move the member |51 rightwardlyto get the tip |41' of the lever |41 to snap over the catch |54 of thepawl |55 so that upon the return or leftward movement of the member |51the lever |41 will be moved to cause the disengagement of the clutch.The means for moving the member |51 rightwardly comprises a relativelylong arm which extends rearwardly of the member |51 to terminate at apoint overlying the cam member |20. At the end of the arm I 80 there isprovided a downwardly extending pin 8| which engages an angular camgroove |82 (see Figure 6) which extends through approximately onerevolution about the periphery of the drum shaped cam member |20. Thegroove |82 starts at the left edge of the cam member and moves in arelatively short portion |82 of its angular length, proceeding in acounterclockwise direction about the cam member,v to

the right side of the cam member, the groove -wardly until the catch|54' is snapped over the tip |48' of the lever |41. In the furtherclockwise movement of the cam member |20 the member |51 dwells in itsrightward position, the

.member |51 remaining in this position until the cam member |20 isreturned suiiciently in a counter-clockwise direction to cause the pin|8| to re-engage the curved portion |82' of the cam groove as ishereinafter described.

While I have here shown and described the preparing of the means fordisengaging the clutch |31 as occurring during the initial clockwisemovement of the cam mechanism ||1, it will be understood that thispreparing may occur at any time during the functioning of the cammechanism so long as it occurs before the function of the cam mechanismis completed, leaving the cam mechanism to cause the disengagement ofthe clutch |31 as its final action.

Another in the series of actions automatically performed by theclockwise movement of the cam mechanism ||1 is the setting of theresurfacing tool into operative position. Before this tool setting takesplace I prefer that the carriage movement be stopped so as to permit anaccurate setting of the resurfacing tool on the record; it is, however,to be understood that a stopping oi' the carriage is not necessarilyessential to the operation of my invention, particularly since theprovision of a tool-setting gauge, heretofore described, enables thesetting of the tool witha high degree of accuracy while the carriage isyet being fed across the record. A means for stopping the movement ofthe carriage is shown in Figures 1, 2, 7 and 10, and comprises arelatively long, laterally extending lever |83 pivoted centrally thereofby a pin I 84 to the top of a post |85extending upwardly from the baseplate ata point slightly tothe rear and to the left of the vstandard 3.Ihe left end portion |83 of the lever terminates at a level just above arearward extension 10 of the feed nut supporting arm 10, the rightportion of the lever |85 being offset slightly to the rear to clear thestandard 3 and terminating in a downwardly extending arm |86, turnedover from. the lever. Pivoted to the lower end of the arm |86, by a pin|88, is a relatively short arm extension |89 which passes through anopening |81 in the base plate. This arm extension is normally held in asubstantially downward but slightly rearwardly inclined positionrelative to the arm |86, as against a stop lug |99 on the arm |86, by atension spring |9| connected between a turned-over lug |92 on the armextension I 89 and the stop lug |90. The lever |83 is biased in aclockwise direction as viewed from the front, by a tension spring |94connected between the lever |83 and a pin |95 on the standard 3, to urgethe arm extension |89 downwardly towards the cam member ||9. 'I'he armextension |89 is, however, normally held just free of the cam member |I9by a stop pin |93 on the standard 3 which restricts the movement ofthelever |83 in its biased direction. When the cam member ||9 is turnedin aA clockwise direction through approximately 45 from its initialposition, the arm extension |89 encounters an inclined 'cam face |96forming the start of a ridge |96 which extends around the rim H9 of thecam member to Within approximately 25 of the position on the cam memberwhich is adjacent the arm extension |89 when the cam mem ber is in itsinitial position. By the contact of the arm4 |89 with the face |96', thelever |83 is tilted in a counter-clockwise direction. When this tiltingoccurs the carriage is in the end portion of its rightward travel withthe left end |83 of the lever |83 directly above the rearward extension10 of the feed nut supporting arm 10.

Thus, in the tilting of the lever |83 the end |83 thereof impinges uponthe extension 10 to move the feed nut 1| downwardly out of engagementwith the feed screw 65, thereby stopping the movement ofl the carriage.In the further clockwise movement of the cam member subsequent to thecontact of the arm |89 with the cam face |96', the feed nut is retainedout of engagement with the feed screw, by the contact of the armextension |89 with the ridge |96,'the feed nut being re-engaged with thefeed screw when the arm extension |89 moves off from the end |96l of theridge as is later explained.

It is important that the carriage be retained in the end portion-,of itsrightward travel during the time the feed nut is disengaged from thefeed screw in order that the resurfacing tool may be set into operativeposition while the tool is yet off the record. In order to preventpossible accidental manipulations of the carriage during the time thefeed nut is disengaged from the feed screw, there is provided in theextension 10 of the feed nut supporting arm a notch 18 which, as theextension 10 is moved downwardly by the lever |83 to disengage the feednut from the feed screw, engages a post |99 extending up from the baseplate I, thereby locking the carriage.

. The action which is vnext performed by the cam mechanism after thestopping of the carriage is the setting of the resurfacing tool intooperative position'. The means for setting the tool is shown in Figures2, -7 .and l0 and comprises a rocker arm |91 pivoted centrally thereofby a screw-l I9 8 to the upper uend of an `upright support |99 securedto the right side of the standard 3 by the screws 200. The support |99is offset to the right in order to position the rocker arm |91 so thatits forward end portion |91' will be directly below a cross pin 20|,carried on a rearwardly extending arm 46" of the tool-setting lever IE6,when the carriage is in the end portion of its rightward travel. Arocking of the arm |91 in a direction to raise its forward end portion|91-i. e., a clockwise turning of the rocker arm |91 as it appears inFigure 2-will then impart a counter-clockwise or tool-setting movementto the lever 06.

The means for so moving the rocker arm |91 comprises a link 262 pivotedby a screw 203 to the rearward end of the rocker arm. Forming a downwardextension of the link 202 is a bar 29d which is adjustably connected tothe link by a pair of shoulder screws 205, the screws passing through apair of respective slots 206 in the link 262 to thread into the bar. Thebar 204 extends downwardly through the opening |81 in the base plate andterminates in a yoke 204' disposed between the cam members H9 and |20and provided with an elongated slot 201 through which passes the sleeve|21 on which the cam members are mounted. The sleeve thus restricts themovement of the yoke 204 to straight up and down reciprocative motion.In order to impart such motion to the yoke 204 by the clockwise turningof the cam mechanism H1 the yoke 205 is provided with a pin 208 whichengages a cam groove 209 provided in the right face of the cam memberH9, as shown in Figure 7. When the cam mechanism |l|1 is in initialposition the forward end portion |91 of the rocker arm |91 is positionedslightly below and suitably free of the pin 20| of the tool-settinglever 46, this positioning of the rocker arm |91 being controlled by theadjustable connection of the link 292 to the bar 204.

In proceeding in a counter-clockwise direction about the cam member H9from the position in the cam groove 299 occupied by the pin 208 when thecam mechanism is in its initial position as shown in Figure 7, it isseen that the groove 209 dwells along the rim H9' of the cam member I I9through an angular length exceeding the anguiar distance between theinitial point on the cam member and the cam face |96 aforementioned,this angular length of the groove being approximately In proceedingfurther around the cam member H9 through approximately 135 it is seenthat the groove 209 curves inwardly as at 209 towards the axis of thecam member; in proceeding still further through approximately it is seenthat the groove curves outwardly, as at 209, towards the rim l I 9 ofthe cam member. Thus in approximately one revolution of the cam member|9 in a clockwise direction the groove 209 moves in the radial directionof the cam member from its rim to substantially its axis and back againto its rim. In this movement of the cam member the yoke 204 is moved, bythe engagement of the pin 208 with the groove 209, first downwardly andthen upwardly to complete o-ne cycle of reciprocative movement. Thefirst half cycle of this movement-i. e., the downward stroke of the yokeZEW-moves the rocker arm |91 in a clockwise direction to impart acounter-clockwise or tool-setting movement to the lever 46, the firstportion of this movement of the lever i6 causing the-tool to be movedinto operative position and the terminal movement of the lever 46causing the tool to be then locked or set in its operative position asheretofore described., In the second half cycle'of the movement of theyoke 204-i. e., its upward movementthe rocker arm |91 is returned in acounter-clockwise direction to permit the tool-setting lever i9 toreturn by its biasing to its unoperated position, the tool remaining,however, locked in its operative position.

It is seen that when the cam mechanism H1 is moved through approximatelytwo-thirds of one revolution in a clockwise direction, the carriage isfirst stopped and the tool is next set into operative position. Theautomatic action next performed by the cam mechanism H1 after thesetting of the tool is the release of the mandrel brake, hereinbeforedescribed, from operative position. To release the brake there isprovided a slide bar 2H which extends laterally of the machine just'above the base plate and slightly to the rear of the longitudinal rod2|. The slide bar 2H is mounted on left and right bosses 2|2 and 2|3 onthe base plate by a pair of shoulder screws 2M and 2| which pass throughrespective slots Zil and 2|5 in the slide bar to thread into therespective bosses 2|2 and 2I3. At the left end of the slide bar there isprovided a hook 2|6. This hook is adapted to catch on a turned-down lug2|1 on the lever 96 of the mandrel brake to release or move the mandrelbrake to inoperative position as the slide bar is moved to the right. Tocause such rightward movement of the slide bar there is provided on thebar at its rightward end a right-angle arm 2|8 which extends downwardlythrough an opening 219 in the base plate and then rearwardly, at thelevel of the top of the cam member I8, to a position overlying this cammember. The cam member H8 is in the shape of a drum having a camextension 220 provided thereon which starts at a point at about twothirds the angular distance about the cam member proceeding in acounter-clockwise direction. Extending downwardly from the rearward endof the arm 2|8 is a pin 22| which, in the last one third clockwisemovement of the cam member H8, is impinged upon by the cam extension 220to cause the slide bar 2| l to be moved to the right to release themandrel brake,

The action which is caused to occur by the cam mechanism H1 subsequentto the release of the mandrel brake is the rra-engagement of the feednut 1| with the feed screw 65. Reference being had to Figure 7 it willbe seen that the ridge |96 on the cam member H9 terminates as at |96" ata point which is approximately 25 from the point on the cam member whichis adjacent the arm extension |89 when the cam mechanism H1 is in itsinitial position. Thus, when the cam member l |9 has been moved in aclockwise direction through approximately 335 the arm extension |89rides oi from the ridge |96 to permit the lever |83, which is controlledby the cam member I9, to turn in a clockwise direction by reason of itsbiasing until the lever is stopped by the stop pin |93 as heretoforedescribed. This clockwise turning of the lever |83 is suiiicient to freethe left end portion |83 of the lever from the extension 19' of the feednut supporting arm, the upwardly biased supporting arm 10 then movingupwardly to unlock the carriage by the freeing of the notch 10 from thepost |49 and to re-engage the feed nut with the feed screw.

The last in the series of actions caused by substantially one revolutionin a clockwise direction of the cam mechanism I1 is the throwing of thereversing switch 16 to reverse the direction of 75 rotation of the motorM. It will be recalled that to start the machine the ngerpiece I I ismoved downwardly to cause the switch arm |01 to snap into its downwardposition, thereby throwing the switch pole members 11 and 18 to the leftas they appear in Figure 9. To reverse the motor M it is only necessaryto move the switch arm |01 upwardly to cause the pole members 11 and 18to be thrown to the right. To effect this throwing of the switch thelever ||3 is extended rearwardly and downwardly from its axis toterminate in a finger 222 which is radially in line with the cam member|2I. The cam member |2| is in the form of a relatively thin disk havinga short cam extension 223 on its periphery. When the fingerpiece ||5 ismoved downwardly to start the machine the finger 222 is movedsubstantially into contact with the disk portion of the cam member I2I.The cam member |2I is so oriented on its shaft that when the cammechanism is in its initial position the cam extension 223 is displacedapproximately 15 in a clockwise direction from .the nger 222. Thus whenthe cam member I2I is moved approximately 345 in a clockwise direction,which is approximately further than the rotation required to re-engagethe feed nut with the feed screw, the cam extension 223 impinges uponthe finger 222 and moves the lever I|3 in a direction to cause the arm|01 of the switch 16 to be moved upwardly, thereby reversing the motorM.

It will be seen that in the interval between the time the feed nut isre-engaged with the feed screw and the time the switch 16 is thrown toreverse the motor M, the carriage is moved to the right. The cammechanism may be arranged so that this time interval is relativelyshort, the necessary time interval being only that which is required topositively insure the re-engagement of the feed nut with the feed screwbefore the reversing of the motor M. In the present instance, the feednut is re-engaged with the feed screw when the cam mechanism has turnedapproxi--` mately 335 and the motor is reversed when the cam mechanismis turned approximately 345, the rightward movement of the carriage thusoccurring only during a 10 movement of the cam mechanism.

Upon the reversal of the motor M the cam mechanism |I1 is immediatelystarted in a reverse or counter-clockwise direction and the mandrel I8is set in rotation by reason of the oneway action clutch which couplesthe pulley 6I to the mandrel shaft I6. There is also immediatelyimparted to the carriage a record resurfacing movement-i. e. a movementin a leftward direction-by reason of the feed nut being engaged with thefeed screw at the time the motor M is reversed. In order that the feednut will be retained in enaggement with the feed screw during thereverse or counter-clockwise movement of the cam mechanism ||1 the armextension |89 is pivoted on the arm |86, as heretofore described. In thecounter-clockwise movement of the cam member II9 the end |96" of theridge |96 en counters the arm extension |89 and moves it forwardlyagainst the biasing of the spring |9I, the lever |83 remaining duringthis time in its biased position, defined by the contact of the leverwith the stop pin |90, wherein the lever is free of the extension 19 ofthe feed nut supporting arm.

The reverse or counter-clockwise movement of the cam mechanism I1 to itsinital or start position is completed during the first portion of theleftward or record resurfacing movement of the carriage. At the time themotor M is reversed the' pin 208 occupies the position in thecam groove209 as shown in dash dot linesin Figure '1. During the reverse orcounter-clockwise movement ofthe cam mechanism the tool-settingmechanism is adapted/to remain inactive, this being permitted by theprovision of a groove 224, which extends alo-ng the rim 'II9' of the cammember II9, through which the pin 208 may pass. In order to insure thatthe pin 208 will enter the groove 224 in the reverse movement of the cammechanism the yoke 204' is biased upwardly, by a tension spring |99connected between the rocker arm |91 and its support |99, to cause thepin 208 to move upwardly against the rim I I9 of the cam member as soonas the pin has passed out of the groove portion 209" in the nal portionof the clockwise movement of the cam mechanism. As the pin I|18traverses the groove 1224 is encounters a 'tongue-shaped member 225which normally forms a separation between the groove 224 and the groove209. The member 225 is pivoted at at 226 to the cam member and is biasedoutwardly against the rim II9 by a small leaf spring 221 provided in asmall recess 228 in a raised portion 229 of the ca m face which dividesthe cam grooves, 209 and 209" from the cam groove 224, the spring 221having a bracket extension 221 at one end which is secured tothe cammember as by Weld ing and contacting a short arm 230 of the tongue 225at its other end. As the pin 208 traverses the groove 224 in thecounter-clockwise movement of the cam member I I9 the pin encounters theouter edge 225` of the tongue-shaped member 225 and moves it inwardlyand then moves on to enter the cam groove 209, the member 225 snappingback against the rim I I9 when the pin has entered the cam groove 209.During the clockwise movement of the cam member, the pin encounters theinner edge 225" of the tongue 225 and is thereby directed into the camgroove 209 as heretofore de scribed. During -the final return movementof the cam mechanism |I1 the arm extension |89, when '1t rides oi of theridge |96 by way of the cam face |96', snaps back into its normalposition as because of its biasing spring I9I. Also in the final returnmovement of the cam mechanism the member |51 is moved to the left by theengagement ofthe pin I 8| with the curved portion |82 of the cam groove|82 of the cam member |20. This leftward movement of the member |51causes the lever |41 to be turned in a clockwise direction` by itscontact with the catch |54. When the member |51 has reachedits mostleftward position as defined by the engagement of the pin |8I with theend of the cam groove |82 the lever |41 has been turned sufliciently tocause the arm |42 to Asnap over center to the left to cause the clutch|31 to be disengaged. The cam mechanism I |1 is then fully returned toits initial position and in condition for re-operation, the cammechanism being retained in this vposition during the time the clutch|31 is disengaged by the detent |28.

Dfuring the return of the cam mechanism the carriage is moving to theleft. Normally the carriage will be fed suflciently to the left topermit the full return of the lever |65, which is controlled by thecarriage, before the member |51 is moved enough leftwardly to bring thetip of the pawl |55 into the path of the pawl |14, thus normally infsuring that the pawl |14 will get behind the pawl |55 before the latterpawl enters the path of the former. If under any circumstances the pawl|14 shouldget in front of the pawl |55 in its ati return movement itwill snap over the pawl into normal position relative thereto when thelever |65 is returned into its most leftward position.

When the carriage nears its start position, the resurfacing tool havingmoved to the left of the record, a lever 23| which is pivoted on theright side of the carriage by a shoulder screw 232 is automaticallyturned to cause the release of the resurfacing tool to inoperativeposition. Reference being had to Figures l, 2 and 3, it will be seenthat the lever 23| is provided with a forwardly extending arm 233normally contacting the underside of a forward extension 234 of thetool-locking member 55, and with an arm 235 which extends downwardly tothe rear of the carriage. Secured to the top side of the base plate bythe screws 236 is an upstanding bracket 231 having a turned over cam 238lying in the terminal path of the arm 235. When the carriage enters itsstart position the cam 238 impinges on the arm 235 and thereby turns thelever 23| slightly in a clockwise direction. This turning of the lever23| imparts, as by the contact of the arm 233 With the extension 234, aclockwise movement to the member 55 to cause the release of theresurfacing tool from its set position.

Secured on the rear end of the carriage by the screws 239 is a shortdownwardly extending arm 240 which, as the carriage nears its startposition, contacts the lever 96 of the mandrel brake and moves the leverin a counter-clockwise direction through its dead-center position, thelever being then moved onwardly in a counter-clockwise direction by thespring |02 until the shoe ||l| of the mandrel brake impinges against themandrel I8 to render the mandrel brake operative. In thecounter-clockwise movement of the lever 96 to render the mandrel brakeoperative the lug 2 of the lever 96 impinges against the hook 2|6 of theslide bar 2| and moves the bar leftwardly, the pin 22| being at thistime free of the cam extension 220 of the cam member |8, by reason ofthe cam mechanism being in its initial position, to permit the slide barto be so moved.

In accordance with my invention, when the carriage is returned to startposition to complete one cycle 'of reciprocative movement across therecord the carriage not only causes the automatic actions abovedescribed but also causes the stopping of the machine. The stopping ofthe machine may very appropriately occur as an incident to the placingof the mandrel brake into operative position. It is seen that when thecarriage moves the lever 96 through dead center position the lever ismoved onwardly by the spring |02 to render the mandrel brake operative.This final movement of the lever 96, which is caused by the spring |02,opens the aforementioned switch 83, this opening of the switch 83causing the machine to be stopped since the s-witch is serially includedin the power supply circuit '14 of the machine when the reversing switchI6 is thrown to Cause a return or leftward movement of the carriage.Reference being had to Figures 1 and 10 it will be seen that the switch83 comprises a frame 24|, secured to the top side of the base plate inthe rearward left-hand portion thereof by the screws 242, and having astack 243 l insulatedly carrying a pair of forwardly extending left andright contact springs 244 and 245 biased into a normally closedcondition. These contact springs 244 and 245 are connected by means of acable 246, which passes through an opening 241 in the frame 24 into themotor circuit. Secured to the left contact spring 244 is an insulatingbar 248 which extends forwardly from the switch by way of an opening 248in the frame 24| into a position directly to the left of the slide bar2| When the slide bar 2|| is moved leftwardly by the final movement ofthe lever 96 to place the mandrel brake into operative position, theslide bar impinges upon the bar 248 and thereby moves the contact spring244 leftwardly to break connection with the contact spring 245, themotor circuit 14 being thus opened to stop the machine.

In recapitulation, it is seen that the switch 83 is included in themotor circuit until the machine is restarted to produce a rightwardmovement of the carriage by throwing theA reversing switch 16. When thecarriage reaches the end of its rightward travel the switch 'H6 isautomatically reversed to again include the switch 83 in the motorcircuit; however, before the switch 16 is thrown to reverse the machinethe mandrel brake is released or moved to inoperative position. Thisrelease of the mandrel brake permits the switch 83 to close by its ownbiasing so that when the switch 'i6 is thrown to reverse the machine,the machinel is rendered operative to eifect a record resurfacingmovement of the carriage.

After the carriage has returned to start position, having moved back andforth across the record to complete a resurfacing operation on therecord, the machine may be restarted to complete another recordresurfacing operation by throwing the switch 1B, as by merely pressingthe fingerpiece l5 downwardly to a position wherein it is substantiallyon the level with the base plate. In-the proper operation of the machinethe switch .'6 should be manually thrown t0 reverse the machine onlywhen the carriage is in its start position since the mandrel brake isnot rendered operative and the tool is not released until. this positionof the carriage is reached. To prevent possible accidental manipulationof the switch 'l5 while the carriage is out of start position there isprovided along the length of the guide rail a bar 249 which isslidablymounted for limited movement along the guide rail by a pair ofscrews 25|) and 25| which pass through longitudinal slots 259 and 25|'in the bar to thread into respective left and right bosses 250" and 25|"extending forwardly of the guide rail. At the right end of the bar 249there is provided a turned-over lug 252. When the bar 249 is in itsrightward position, as dened by the contact of the screws 258 and 25|with the slots 259 and 25V, the lug 252 forms a cap over the ngerpieceH5 to prevent access thereto. The bar 249 is normally held in its mostrightward position by a tension spring 253 connected between a pin 254on the bar and a pin 255 on the guide rail. However, as the carriage ismoved leftwardly into its start position-the switch 76 having beenreversed and the lingerpiece ||5 being in an upward position as shown inFigure Z-the lower end of its front portion 22 impinges upon anupstanding hook 249 provided at the left end of the bar 249 and movesthe bar 249 leftwardly to move the lug 252 off from the ngerpiece ||5.The ngerpiece IE5 is then free to be manually moved downwardly torestart the machine.

If the operator should for any reason desire to stop the operation ofthe machine during the course of a tool-.carriage reciprocation acrossthe record he may do so by throwing a single-pole single-throw switch256, preferably of the toggle variety, which is serially included in thepower supply circuit 14 as shown in Figure 9'. 'Ihe switch 256 is shownin Figures 1 and 2 and is mounted in a recess 251 in the carriage 22near the front portion 22' thereof. The switch 256 is provided with athreaded tubular neck portion 258 extending through the right wall ofthe carriage on which there is threaded a nut 258 to hold the switch inplace. Extending from the neck portion 258 to the right of the carriageis an arm 266, and leading from the switch is a cable'2r6lby which theswitch is connected in the power supply circuit 14. The switch is sooriented that the switch arm 26D will move in a substantially verticaldirection, with upper and lower positions of the switch arm representingthe closed and open conditions of the switch. To facilitate theoperation of the switch there is provided a lever 262 which is pivotedby a shoulder screw 263 on the right side of the carriage, the leverbeing spaced from the carriage by a spacer 264 embracing the screw 263.'Ihe forward end of the lever 262 terminates in a handle portion 262';just to the rear of the handle portion 262 are provided upper andlowerturnedover lugs 265 and 266 to form a socket which engages theswitch arm 260. Thus as the lever 262 is moved, as by its handle portion262', into downward and upward positions the switch arm 26D is moved tothrow the switch 256 into its open and closed positions to stop andstart the machine. In order that the resurfacing tool may also bereleased to inoperative position as an incident to such stopping of themachine the lever 262 is extended rearwardly of its axis and thereprovided with a turned-over lug 261 adaptedto form a seat which, whenthe lever 262 is moved downwardlyto stop the machine, impinges upon aforwardly extending arm 268, provided on the tool-locking member 55, tomove the member 55 in a clockwise direction and thereby effect therelease of the resurfacing tool. g

When the resurfacing of the record is cornpleted, usually one cut fromthe record being sufcient, the record is removed from the machine. Toremove the record the endgate latch I0 is first moved to inoperativeposition to permit the endgate 8'to swing open, as by its biasing, andthen the record is ejected from the mandrel. A record ejector of thetype shown in the figures is well known in the art, and is suflicientlydescribed as follows: A leftWardly .extending handle 268 having a hub210 is pivoted on a pin 21| supported at one end by the guide rail l2and at the other end by the intermediate standard 5. From the hub 216there extends a vertical. arm 212 carrying a shoe 213 adapted to impingeagainst lthe left end of the record when the ejector is operated. Theejector is normally maintained in an unoperated position, shown inFigure 1, by a torsional spring 214 coiled about the hub 218 andconstrained at its ends by the handle 269 and base plate I. To operatethe ejector the handle 269 is raised against the force of the spring 214to move the shoe 213 rightwardly against the record to push the recordoli' from the mandrel.

In accordance with my invention'there may be provided means by which themachine is put into operation, as an incident to the mounting of arecord on the machine, to cause a resurfacing of the record so mounted.The last of the operations in the mounting of a record' on the machineis the latching ofthe endgate 8 into its closed position. This latchingof the endgate may cause the machine to be putintooperation to completearesurfacin'g ofl the record, as by the means shown in detail in Figures12 and 13. It is seen that the endgate latch IID is in the form of abolt 215 passing through a horizontal recess 216 in the right endportion I2' of the guide rail and connected to a vertical shaft 211pivoted in an opening I2 extending downwardly from the recess 216through the end portion I2' of the guide rail. The upper end portion211' of the shaft 211 is `reduced in diameter and threaded to -receive anut 218 which rests on the portion l2 to hold the shaft against downwardmovement; the intermediate portion 211" of the shaft is milled into theshape of a bar (see Figure 13) and the bolt 215 is apertured to receivethis bar-shaped portion, thereby keying the bolt to theshaft. Secured tothe lower end of the shaft 211, by a pin 219, is an arm 280 whichextends rightwardly in line with the bolt 215 to terminate at a .pointoverlying the lever II3.

Pivoted on the lever H3, by a screw 28|., is a V-shaped pawl 282 whichis so disposed relative to the arm 280 as to lie directly in front ofthe arm when' theV endgate latch I0 is in operative position. The pawl282 is biased in a clockwisedirection towards the arm. 288, against astop lug 283`on the `lever H3, by a tension spring 284. connectedbetween the pawl and a lug 285 on the lever H3. When the endgate latchI0 is opened or moved to inoperative position the arm.

280 impinges against the pawl and moves the pawl against its biasing,the a'rm thus sliding over the pawl and the pawl then snapping back intoits biased position. When the endgate latch is'moved to operativeposition the arm 280 impinges upon an inclined cam face 286 of the pawland thereby moves thejlever H3, which carries the pawl 282, downwardlyto throw the switch 16 so as to start the machine. Thus by the lockingof the endgate into closed or operative position-which is the finalaction in the mounting of a record on the machine-the machine is putinto voperation to effect a resurfacing of the mounted record.

While I have herein described and illustrated one embodiment of myinvention it will be understood that this embodiment isl subject to manychanges and modifications without departure from the scope of myinvention, which I undertake to express according to the followingclaims.

I claim: Y

1. In a phonograph record resurfacing machine having a4 record supportand a carriage: the combination of a resurfacing tool on said carriagesettable into operative position relative to a record on said support;driving means for feeding said carriage across said support; and meanseffective without prior adjustment of the tool relative to the recordand operated by said driving means to automatically set said tool into1operative position.

2. In a phonograph record resurfacing machine having a record support:the combination of a carriage; a resurfacing tool on said carriagesettable into Voperative position relative to a record on said support;means for moving said carriage across said support; and power-operatedmeans, effective without prior adjustment of the tool relative totherecord and controlled by said carriage, for automatically setting saidtool into operative position.

3. In a phonograph record resurfacing machine having a support for arecord to be resurfaced and a carriage movable along said support: thecombination. of aresurfacing tool on said carriage having a fullyreleased position and movable therefrom into 'operative relationshipwith the record; tool-setting means comprising resilient means foryieldably moving said tool in one operation from.` said fully releasedposition into said operative relationship with the record; driving meansfor said carriage; and means for causing operation of said tool-settingmeans by said driving means.

1 4. In a phonograph record resurfacing machine having a support for arecord and a car- -riage movable along said support: the combination ofa resurfacing tool on said carriage movable towards and away from therecord; toolsetting means for moving said tool towards the recordl intooperative position relative thereto, said means comprising means adaptedto coact with the record to determine said operative position of thetool; and power means, controlled by said tool-carriage, for operatingsaid tool-setting means.

5. In a phonograph record resurfacing machine having a rotatable recordsupport and a carriage: the -combination of record-resurfacing meansmounted on said carriage and settable into operative position relativeto a record on said support; power means placeable in operation 'tocause said record-resurfacing means to be set into operative position;and means, operated by said power means and automatically renderedeffective subsequent to the completion of the setting of saidyresurfacing means, for starting both a rotation of said record supportand a record resurfacing movement of said carriage.

6. The structure as claimed in claim 5, further including means, fullycontrolled by said carriage at the completion of its record-resurfacingmovement, for moving said record-resurfacing means out of set positionand for stopping said power means.

7; In a phonograph record resurfacing machine having a record support:the combination of a carriage having record-resurfacing means mountedthereon; power operated drivin-g means placeable into operation to causesaid carriage to be reciprocated along said support; and means, fullycontrolled by said carriage at the completion of a single cycle in itsreciprocative movement, for placing said driving means out of operation.

8. In a phonograph record resurfacing machine having a record supportand a resurfacing tool settable into operative position relative to arecord on said support: the combination of a carriage for saidresurfacing tool; driving means for reciprocating said carriage alongsaid support; means, controlled by said carriage at the completion ofthe first half cycle in its reciprocative movement, for setting saidtool into operative position; and means, controlled by said carriage atthe completion of a single cycle in its reciprocative movement, formoving said tool out of operative position and stopping said drivingmeans.

9. In a phonograph record resurfacing machine having a record supportand a resurfacing tool settable into operative position relative to arecord on said support: the combination of a carriage for said tool;reversible driving means for feeding said carriage back and forthrelative to said support; tool-setting means; reversing means for saiddriving means; and means, controlled by4 said carriage, for operatingsaid toolsetting means and reversing means in the sequence here named.

10. In a phonograph record resurfacing machine having a rotatable recordsupport; a toolcarriage: the combination of a reversible driving meansforreciprocating said tool-carriage along said support; and one-wayaction means rotatably coupling said driving means with said recordsupport to cause rotation of said support only during one half cycle ofeach tool-carriage reciprocation.

11. In a phonograph record resurfacing machine having a record support:the combination of a tool carriage; driving means for reciprocating saidcarriage along said support; and power operated means, controlled bysaid carriage, for causing a pause in the carriage movement at thecompletion of the first half cycle of each carriage reciprocation.

12. In a phonograph record resurfacing machine having a record supportand a carriage resurfacing means on said carriage settable intooperative position relative to a record on said support: the combinationof driving means for reciprocating said carriage relative to saidsupport; means for causing a pause in the movementof the carriage at thecompletion of the rst` half cycle of each carriage reciprocation; andmeans, controlled in predetermined relation to said last-mentionedmeans, for setting said resurfacing means into operative position withinthe time interval of said pause.

13. In a phonograph record resurfacing machine having a record support:the combination of a tool-carriage movable back and forth along saidsupport; feeding means for said carriage normally operatively connectedtherewith; means, rendered operative when said carriage is fed into theend portion of its travel, for rendering said carria-ge disconnectedfrom its feeding means for a predetermined time interval; and means,responsive to said last mentioned means subsequent to said timeinterval, for reversing said feeding means to cause a return feed ofsaid carriage.

14. In a phonograph record resurfacing machine having a record supportand a carriage and a resurfacing tool on said carriage settable intooperative position relative to a record on said support: the combinationof reversible driving means for feeding said carriage back and forthrelative to said support; means, controlled by said carriage, forrendering said driving means inoperative to feed the carriage and forsetting said tool into operative position; and means, operated by saiddriving means subsequent to the setting of said tool, for rendering saiddriving means operative to feed the carriage and for reversing the same.

15. The structure as claimed in claiml 14, further including meansoperatively connecting said driving means with: said record support forcausing rotation of said support during the half cycle of carriagereciprocation subsequent to said pause.

16. In a phonograph record resurfacing machine having a record supportand atool-carriage: the combination of reciprocating means normallyoperatively connected with said tool-carriage for advancing andreturning the tool-carriage along said record support; cammeans moved inone direction by said reciprocating means at the completion of theadvance ofthe tool-carriage and returned'in the other direction duringthe initial return of the tool-carriage; means operated by said cammeans in its movement in said one direction, for temporarilyldisconnecting said reciprocating means from said tool-carriage ;1 andmeans,

associated with: said,- cam` means, for rendering direction.

, 17. In a-phon'ograph record resurfacing machine having ;a recordsupport: the combination of a tool-carriage; driving means for feedingsaid tool-carriage along said .record support in ,and against `adirection of normal record-resurfaclngmovement; manipulatable means forcontrolling the direction of feed of said carriage; and means,associated with -said tool-carriage, for preventing manual. operation ofIsaid .manipulatable means. While the carriage. is progressing throughits record-resurfacing movement.

18..In a phonograph recordresurfacing machine havinga recordsupportathecombination of a tool-carriage; kdriving means placeable into operationto produce one cycle of reciprocative movement of said tool-carriageacross said support; manipulative means for rendering said driving meansoperative to produce the cycle of carriage movement; and. means,-controlled by said carriage, for rendering said `manipulative meansinaccessible.A for-*operation While said carriage is progressing throughthe major part of its cycle of movement.

19. In a phonograph record resurfacing machine having a record support:the combination of a tool-carriage; driving means for feeding said toolcarriage along said record support from and towards a start position;manipulatable means for controlling said driving means; and means.associated with said tool-carriage, for rendering said manipulativemeans ineiective While the carriage is out of start position.

20. In a phonograph record resurfacing machine having a rotatable recordsupport, a brake for restraining said record support against rotationand a tool-carriage: the combination of driving means for reciprocatingsaid tool-carriage across said support; and means, operated by saiddriving means at the completion of one half cycle of each carriagereciprocation, for rendering said brake inoperative and subsequentlycausing said record support to be set into rotation.

21. The structure as claimed in claim 20, further including means,responsive to the terminal movement of the carriage at the completionvof each cycle of its reciprocation, for rendering said brake operativeand coordinately rendering said driving means inoperative.

22. In a phonograph record resurfacing machine having a rotatable recordsupport: the combination of a tool-carriage; driving means for rotatingsaid record support and concurrently imparting a record-resurfacingmovement to said tool-carriage; and means, controlled by saidtoolcarriage, for braking the rotation of said support and coordinatelystopping said driving means at the completion of the record-resurfacingmovement of said carriage.

23. In a phonograph record resurfacing machine having a rotatable recordsupport, a toolcarriage and driving means for rotating said recordsupport and concurrently imparting a record-resurfacing movement to saidtoo-l-carriage: the combination of means, operated incidental to thecompletion of the record-resurfacing movement of said tool-carriage, forbraking the rotation of said record support; and means, operated by saidbraking means, for stopping said driving means.

24. In a phonograph record resurfacing m'achiney having a, recordsupport and means for rotating said rs upportzj the combination ofcontrol means for said rotating means; means for braking- V the.rotation of said support; and springmeans for operating saidbrakingmeans and coordinately operating-said control means to renderlsaid rotating means inoperative.

25. In la{,}; honograph record resurfacing machinehaving a rotatablerecord support and a brake for retarding the rotation of said support:the combination of la tool-carriage; driving means for vreciprocatingsaid tool-carriage across said record support; means, operated at thecompletion -of..the,iirsthalf cycle of each tool-carriage reciprocation,lfor rendering said brake inoperative and for causing said recordsupport tobe coupled Withsaiddriving means to place saidsupport.inrotation; and means, responsive to the-movementof.y the tool-carriageat the completion of each reciprocation thereof, for render- I ingsaidbrake operative and said driving means inop erative..- i

26, IThestructureas claimed in claim 25, further including manipulativemeans, operable at the completion-.ofone cycle of tool-carriagereciprocation;forrestartingsaid driving means to cause saidtool-carriage to be moved through another cycle of its reciprocativemovement.

27. In a phonograph record resurfacing machine having a rotatable recordsupport, braking means for said support and a resurfacing tool settableinto operative position relative to a` record on said support: thecombination of driving means reversible to feed said carriage back andforth along said support; means controlled by said carriage in responseto a feeding movement of the carriage in one of its movable directions,for setting said tool into operative positionL rendering said brakingmeans inoperative, and reversing said driving means to feed the carriagein the other of its movable directions; and means, rendered effectiveupon the reversal of said driving means, for causing rotation of saidrecord support during the feeding of said carriage in said otherdirection.

28. In a phonograph record resurfacing machine having a record supportand a tool-carriage: the combination of feeding means for advancing saidtool-carriage along said support comprising a motor having a maincircuit; means selectively operable to reverse the direction of rotationof said motor to cause a return of said tool-carriage; and means,included in said circuit as an incident to the reversal of said motor,for -controlling the rate of the return of said toolcarriage.

29. In a phonograph record resurfacing machine having a record supportand a tool-carriage: the combination of feeding means for advancing saidtool-carriage along said supportv comprising a motor having a maincircuit; means selectively operable to reverse the direction of rotationof said motor to cause a return feed of said tool-carriage; and switchmeans, included in said circuit as an incident toy the reversal of saidmotor, for stopping the return feed of said tool-carriage.

30. In a phonograph record resurfacing machine having a record supportand a tool-carriage: the combination of feeding means for advancing saidtool-carriage along said support comprising a motor having a field andan armature; a main circuit for supplying power tosaid motor; areversing circuit connectable into said main circuit to reverse thepolarity of said field with respect to said armature so as to reversethe direction of feed of said tool-carriage; and switch means in saidreversing circuit, operated incidental to the reverse feed of saidtool-carriage, for stopping said feeding mans.

fsaid field with respect to said armature so as to reverse the directionof feed of said tool-carriage; and switch means in said reversingcircuit, operated incidental to the reverse feed of said toolcarriage,for opening said reversing circuit to stop 1 said feeding means. i

32. In a phonograph record resurfacing machine having a movabletool-carriage: the combination of feeding means forsaid tool-carriagenormally operatively connected therewith; means .'for disconnetcing saidtool-carriage from said feeding means; and means, rendered effectiveupon the disconnection of said tool-carriage from said feeding means,for locking the tool-carriage.

33. In a phonograph record resurfacing machine having a rotatablemandrel for supporting a record to be resurfaced; and an endgate forsaid mandrel: the combination of a latch for said endgate; driving meansfor the machine placeable into operative and inoperative conditions; andmeans, controlled by said latch, for placing said driving means intooperative condition.

34. In a phonograph record resurfacing machine: the combination of arotatable support for a record to be resurfaced; a resurfacing toolsettable into operative position relative to a record on said support; acarriage for said tool movable in a direction operative to cause aresurfacing of a record on said support by said tool; power meansplaceable into operation to set said tool and to subsequently rotatesaid record support and impart a record resurfacing movement to saidcarriage; and means, operated as an incident to the completion of amounting of a record on the machine, for placing said power means intooperation to cause a resurfacing of the mounted record.

RICHARD M. SOMERS.

CERTIFICATE OF`CORRECTION.

Patent No.' 2,209,855. July 5o, 191m.-

RICHARD M. soMERs.

It is hereby certified that.l error appears in the vprintedspecification of the above numbered patent requiring correction asfollows: Page 9,l first column, line 60, for "enaggement" read--engagement; line '275, for "inital" read --initial; and second column,line 19., for "is" read it; line 22,

for "at at" read --as' at.; page l2,- second column, line l, claim l0,for "support;" read "support and; line 19, l claim l2, before"resurfacing" insert and; page 1h., first column, line 5, claim 50, for"'mans" read -means; line 25, claim 52, for disconneteing" read--disconnecting--g and that the said Letters Patent shouldbe read withthis correction therein that the same may conform to the record of thecase inthe Patent Office.

Signed and sealed this l2th day of November, A. D. l9).|..

Henry Van Ar sdale (Seal) Acting Commissioner of Patents.

